This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 273 |
| 3 | 8211 |
| 4 | 98835 |
| 5 | 710710 |
| 6 | 3659110 |
| 7 | 14886186 |
| 8 | 50816298 |
| 9 | 151416111 |
| 10 | 404746111 |
| 11 | 990005445 |
| 12 | 2248888005 |
| 13 | 4798557036 |
| 14 | 9703780828 |
| 15 | 18730825828 |
| 16 | 34711648356 |
| 17 | 62053834605 |
| 18 | 107439683325 |
| 19 | 180766879111 |
| 20 | 296393439111 |
| 21 | 474761104818 |
| 22 | 744484165986 |
| 23 | 1145004918190 |
| 24 | 1729932641710 |
| 25 | 2571200219835 |